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Look for dents and bumps in the metal roads. Tracks guide the roller assembly, so that are important. Check https://www.locksmiths-r-us.co.uk/homerton-locksmiths/ as well and tap affected areas back into position when realistic.
The standard garage doors are cheaper and easier to repair if you find a mishap in the future. https://www.locksmiths-r-us.co.uk/tamworth-locksmiths/ are usually 7 feet in height and the width depends if it is for single or double car. https://www.locksmiths-r-us.co.uk/ come ready made and therefore would have standard spares for repair or maintaining in the future.